Mc, I would recommend Reloder 7 as a good place to start, Hornady shows 31.6gr(1300fps) start to 45.7gr(1900fps) max in their trapdoor data, but their test barrel is 29½"!! Their levergun data which uses a 22" barrel, is 44.7gr(1600fps) start to 52.3gr max(2000fps).
Tim